Piston-ring.



H. H. PATRICK.

PISTON RING. APPLIOATION nun JAN. 22, 1913.

1,083,1 3 0. Patented Dec. 30, 1913 a 1 Fig.2.-

1| 1 L 'H b Fig 3 WITNESSES Fig 4 INVENTOR w W Huerf H ry/ uffie? B W -'x ATTORNEY5 HUBER! HARRY PATRICK, 0F BIRMINGHAM, ENGLAND,

ASSIGNOR 050 THE OXYGEN WELDING WORKS LIMITED, OFBIRMINGHAM, ENGLAND.

PISTON-RING.

' specification of Letters Patent.

To all whom it may concern: I

Be it known that I, HUBERT' HARRY Par men, subject of the King of Great Britain, residing at 50 Sandwell road, Handsworth, in the city of Birmingham, England, en-

gineer, have invented certain new and useful Improvements Relating to Piston-Rings, of

which the following is a specification.

This invention relates to piston rings, for, more especially, internal combustion engines, although it is not limited to such rings being applicable to cast-iron and steel'piston rings for a variety of purposes.

Theinvention has for its object to con-f each other, or in other words, with their opposite edges and the intermediate circumferential division all parallel to each bther. But difficulties have been experienced in the manufacture of such rings, and it has not before been possible at moderate cost to produce machined or truly accurate faces adjacent to each other along the said division.

According to this invention a pair-of cast iron, steel or other metal rings transversely divided are machined or otherwise made truly fiat and smooth on the-two opposite edges, and a pair of such rings are unitedby autogeno-us, electrical or other welding along a portion of their edges near a pair of opposite ends in such a way that they form a split ring having a pair of convolutions and the outer and intermediate edges all parallel to each other.

In the accompanying sheet of explanatory drawings :-F1gure 1 1s a perspective view of a piston ring constructed 111 accordance with this invention. Fig. 2-is a side eleva-- tion of the elements from whichthe ring is constructed. Figs. 3 and 4 are side elevation and plan of'the finished ring.

shown in Figs.

In carrying the invention into effect as shown, a pair of CEISt'II'OII or steel rings a and b (Fig. 2) are formed in any convenient manner, and all the surfaces or only the.

sides and outer periphery are machined to the requiredsize. The rings are divided transversely, and a pair of opposite ends of the two rings are welded together along a portion of -their side faces by autogenous, electric or other similar process. Grooves or the like may be provided in the adjacent faces of the parts to be welded to receive the welding material. quently cleaned up on the periphery, and are hardened if required. A-finished ring is 1, 3 and 4.

ring constructed as aboye described is superior to the rings ordinai rily employed, and is also superior to rings'of similar form made by other methods. As the intermediate faces when in position lie in close contact with each other, and the gaps at the ends of the two'convolutions are on opposite s des of the united portion of the convolutlons no gas can pass the same.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is The method of making split piston rings as herein described, ployment of a pair of similar and coaxial metal rings and uniting a pair of opposite overlappin ends along a portion of their .The rings are subse- Patented Dec. 30, 1913. Application filed January 22, 1913. Serial No. 743,520.

consisting in the emadjacent si e faces by welding, substantially as described.

In testimony. whereof I have signed my name to this specification in the presence of tWo subscribingwitnesses. 7

HUBERT HARRY PATRICK.

- Witnesses JOHN MORGAN, FRANCIS MALPAS. 

